Which of the following pairs does not share the same empirical formula?

1) CH2O and C3H6O3

2) PbCl2 and PbCl4

3) NO2 and N2O4

4) C3H12 and CH4

A jar of crunchy peanut butter contains 1.43kg of peanut butter. if you use 8.0% of the peanut butter for a sandwich, how many ounces of peanut butter did you take out of the container?

The movement of particles from a less crowded area to a more crowded area requires what

A chemist prepares a solution of calcium bromide CaBr2 by measuring out 4.81μmol of calcium bromide into a 50. mL volumetric flask and filling the flask to the mark with water.

Why are bacteria required in the nitrogen cycle? A. Nitrogen needs to be fixed before it is used by plants. O B. The xylem in plants cannot function without bacteria. O C. Plant DNA can only be transmitted by bacteria. 0 D.

Which group of elements on the periodic table can have more than one possible charge? noble gases alkali metals alkaline earth metals transition metals

When table salt is placed in water and stirred it dissolves and a clear liquid is obtained. This process is a

Carbonic acid is generated by bubbling co2 into a beaker of water. If it took 5 minutes for this reaction to reach equilibrium, how would the results differ if the enzyme carbonic anhydrase was added to the beaker of water?

Part a which element can expand its valence shell to accommodate more than eight electrons? which element can expand its valence shell to accommodate more than eight electrons? he h f b s

What are some reasons why the research should be put through a peer-review process?

what are scientists who study fossils called? (a) astronomers. (b) biologists. (c) geologists. (d) paleontologists.